[Equest-users] Fenestration and Window to Wall Ratio

[Arpan Bakshi]

This is an important point to clarify. While the baseline WWR is a  
percentage of total wall area, the amount of glass on each exposure is  
to be proportional to the amount with which each exposure in the  
proposed case is glazed.


----------------------------
Arpan Bakshi
YRG sustainability
Direct 646.704.2880

Sent from my iPhone

On Feb 8, 2011, at 7:29 PM, James Newman <James.Newman at me- 
engineers.com> wrote:

> Correct, so if your proving prescriptive compliance you can use  
> below grade walls, while if your proving compliance through  
> performance modeling then you can only usie above grade walls per  
> ASHRAE 90.1 Appendix G.
>
>
>
> The question that I still have is should the whole building be  
> averaged for fenestration percentage or should each face have its  
> own percentage?
>
>
>
> James M. Newman, EIT, LEED AP
>
> project engineer / energy analyst
>
>
>
> From: Dana Troy [mailto:DTroy at glumac.com]
> Sent: Tuesday, February 08, 2011 5:09 PM
> To: James Newman
> Cc: equest-users at lists.onebuilding.org
> Subject: RE: [Equest-users] Fenestration and Window to Wall Ratio
>
>
>
> 90.1 Appendix G states: "Vertical fenestration areas for new  
> buildings and additions shall equal that in the proposed design or  
> 40% of gross above-grade wall area, whichever is smaller."
>
>
>
> If you are using 90.1 as your State's code, then you can include the  
> below-grade wall area. If you are modeling using Appendix G, then  
> you cannot include the below grade wall area in your calculations.
>
>
>
> -Dana
>
>
>
>
>
> Dana Troy
>
> Senior Energy Analyst
>
> GLUMAC | 503.227.5280
>
>
>
>
>
>
>
>
>
> -----Original Message-----
> From: James Newman [mailto:James.Newman at me-engineers.com]
> Sent: Tuesday, February 08, 2011 3:29 PM
> To: Sunayana Jain
> Cc: equest-users at lists.onebuilding.org
> Subject: Re: [Equest-users] Fenestration and Window to Wall Ratio
>
>
>
> This paragraph comes directly out of the ASHRAE 90.1-2007 User Manual:
>
>
>
> "Window-Wall Ratio: The window-wall ratio is the ratio of vertical  
> fenestration area to gross exterior wall area. The fenestration area  
> is the rough opening, i.e., it includes the frame, sash, and other  
> nonglazed window components.  The gross exterior wall is measured  
> horizontally from the exterior surface; it is measured vertically  
> from the top of the floor to the bottom of the roof. The gross  
> exterior wall area includes below-grade as well as above-grade  
> walls. It is necessary to calculate the window-wall ratio with all  
> compliance options, since this information is need with the  
> prescriptive option, the trade-off option, and the energy cost  
> budget method."
>
>
>
> James M. Newman, EIT, LEED AP
>
> project engineer / energy analyst
>
>
>
>
>
> -----Original Message-----
>
> From: Sunayana Jain [mailto:sunayana_jain at neo.tamu.edu]
>
> Sent: Tuesday, February 08, 2011 4:20 PM
>
> To: James Newman
>
> Cc: equest-users at lists.onebuilding.org
>
> Subject: Re: [Equest-users] Fenestration and Window to Wall Ratio
>
>
>
> Hi James,
>
>
>
> As per my understanding, window wall ratio is considered for above  
> grade walls only for each orientation of building (not floor to  
> floor).
>
>
>
> Thanks,
>
>
>
> Sunayana Jain
>
>
>
> LEED AP, EIT
>
>
>
> Energy Engineering Specialist
>
>
>
> ----- Original Message -----
>
> From: "James Newman" <James.Newman at me-engineers.com>
>
> To: equest-users at lists.onebuilding.org
>
> Sent: Tuesday, February 8, 2011 5:29:50 PM GMT -05:00 US/Canada  
> Eastern
>
> Subject: [Equest-users] Fenestration and Window to Wall Ratio
>
>
>
>
>
>
>
>
>
>
>
> When calculating the window to wall ratio for your baseline  
> building, should you calculate this percentage as
>
>
>
>
>
>
>
> ·          an entire building?
>
>
>
> ·          each building elevation?
>
>
>
> ·          every floor elevation?
>
>
>
>
>
>
>
> Has anyone had an interpretation on this issue?  I was reading  
> through the 90.1 User manual and discovered that both above grade  
> walls and below grade walls should be considered for the wall to  
> wall ratio which leads me to believe the calculation should be done  
> as a whole building percentage. Just curious if someone knows the  
> correct answer.
>
>
>
>
>
>
>
> Thanks,
>
>
>
>
>
>
>
> James M. Newman, EIT, LEED AP
>
>
>
> project engineer / energy analyst
>
>
>
>
>
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